Controlling hydraulically actuated devices



"-Nov. 12, 1940. H. REBESKI CONTROLLING HYDRAULICALLY ACTUATED DEVICES 3Sheets-Sheet 1 Filed Nov. 26, 1937 m-m m M mi ERSL vii ll? 1 IIIIIllllllllll I! '11! III! 'IIIIIIIIIIIIII'IIIA.vIIIIIIIIfl VII/II IFaiented Nov. 12, 1940 coN'rnoLLnvGnYnnaUucALLY ac'rua'rnn DEVICES HansRebeski, Brandenburg, Germany, asslgnor to Arado FlumugwerkeGesellschait mit beschrankter Hattung, Brandenburg, Germany,

a German company Application November 26, 1937, Serial No. 176,767 InGermany December 5, 1936 3 Claims.

to which is regulated by a common valve interposed in the medium supplyand return pipes.

I Inhydraulic presses a displaceable bolt for actu- 15 ating an excesspressure valve is displaced during the pressure balancing periods by thewater in thepressure chamber to such anextent that a connection betweenthe pressure chamber and the pressure balancing conduit is established;

20 In the pumps referred to a valve disposed in parallel between thehigh and low pressure conduit is indirectly actuated by a definitepressure in the high pressure conduit in such manner that it opens adirect connection between the 5 conduit connecting the low pressure andthe high pressure pumps and the oil container.

In these known arrangements the valve controlling the supply of workingmedium isactuated by a definite pressure of the working me- 30 diumproduced in the supply conduit.

Moreover displacing devices have also been suggested in whicha valvecontrolling the supply of worldng medium is actuated in dependence onthe movement or displacement or the corre- 35 sponding structural memberby this member itself.

In these displacing devices a piston 01' a control cylinder follows themovement 01' the structural member displaceable with the aid 01 a 4working cylinder until the desired position of the parts is attained andfinally then at this moment closes the conduit through which the workingmedium, for example oil or compressed. air, is supplied to the controlcylinder. As how- 45 ever the pump for the working medium operatescontinuously there is a possibility that the working medium which afterthe said closing of the supply pipe is compressed still further in theconduit can escape by an excess pressure valve.

50 The pump during the whole time for which no pressure is required hasto overcome the comparatively high pressure to which the valve isadjusted. It should also be noted that the interval of time during whichno pressure is re- 55 quired may be comparatively long particularly whenthe structural member is in its initial position. .As a result in suchcases the pump is excessively heavily stressed.

The invention avoids the disadvantages mentioned by this that the valvethrough the com- 5::

mon action of a member provided for switching on the displacing deviceand an auxiliary member moving together with the structural member. inthe initial position of the structural member, holds open a directconnection between 1 the supply and return conduits, but holds it closedin all other positions of the structural member.

In these other positions of the structural member, the valve orregulating member for the 1 supply of fluid to the device mentioned formoving the structural member automatically into its closing position,and the means for adjusting the regulating member by the hand actuatedswitch means for the moving or displacing device and the auxiliarymember moving with the structural member are actuated.

Further features of the invention. are here'- -inafter described indetail in connection with the accompanying drawings. 1

In the drawings is shown diagrammatically one example of an arrangementin accordance with the invention showing the application 01 a hydraulicdevice for displacing or turning aircraitlanding flaps.

Fig. 1 shows the device in accordance with the invention in sideelevation partly in section and also in perspective the part to be movedin its initial position.

Fig. 2 shows the device in accordance with the invention insideelevation partly in section at the commencement of displacement ofthe part'to be moved from its initial position.

Fig. 3 shows the device in side elevation and partly insection and alsoin perspective the 49 structural part to be moved being in its operatingposition. I Fig. 4 shows the device in accordance with the inventionalso in side elevation and partly in section at the commencement of thereturn movement of the structural member to be moved from the workingposition into the initial position. a

Referring to the drawings, the supply conduit, designated I suppliespressure medium, such as 50 oil under pressure, for actuating the motormeans and the pressure medium is supplied thereto preferably by acontinuously operating pump, not shown. The corresponding returnconduit, through which the pressure medium is 66 by-pass passage 6which, at its right hand end,

communicates with a supplypassage having an enlarged chamber containinga valve ball l2 forming the valve member, which valve member is normallyresiliently seated by the spring 23 and which is adapted to bepositively unseated by means hereinafter described. The valve seat isdesignated 35 and delimits the right hand end of the by-pass passage 6.

In the open position of the valve member i2, when it is displaced fromits seat 35, as shown in Fig. l, the pressure medium flows in thedirection of the arrows through passages l, 6 and 2. In the exampleillustrated, I designates the structural member desired to becontrollably moved which is illustrated as the landing flap of anairplane.

The means for controlling the control valve 3 and the adjustable valvemember |2 oi the regulator valve 5 consists of the double armed lever 8rotatable about a pivot H which lever is pivotally connected with thecasing of the control valve 3 at 3|! and at its upper end preferablycarries aknob or grip for operation by hand. The lever B can act withits lower end 35 in its swinging movement about the pivot I4 on the onearm of a double armed lever II. The end so of an auxiliary lever 9rotatable about a fixed pivot l9 can act on the other arm of this leverII.

The double armed lever H is pivotally connected at its central portionwith a plunger Hi, the one end of which projects from the valve 45housing 5 and which plunger is movable longitudinally in the passage 3in such manner that the free end thereof is engageable with the ball |2for moving it from its seat 35 *against the pressure of the spring 23 asshown in Fig. l. 50 To limit its outward movement the plunger I0 isprovided with a stop collar which bears, in the position shown in Fig.3, against the regulator valve housing 8. A spring 34 or other resilientmember fixed at one end and at the other end 55 connected with theplunger l0 tends to move the plunger l0 into the position shown in Fig.3.

The spring 34 could naturally also actin another manner, in thedirection mentioned, on the plunger m.

The relatively shiftable members of the control valve device 3 consistsfor example of a cylinder in which a control piston |3 provided withsuitable control passages is movable longitudinally. The piston I3 ispivotally connected 65 at its right hand end with an arm 29 which ismounted on a shaft supported in bearings at 32 and 33. This shaft l'|carries the structural member to be moved in the form of the landingflap I and is displaced or turned by the piston 70 I3 movable in thecylinder 4 or the motor means.

To this end the piston rod 24 of the piston I3 is rotatably mounted onan arm 25 carried by the shaft H. The arms 25 and 28 mounted on theshaft H are approximately similarly directed. 75 The shaft carries atits opposite end a further I8 reciprocable therein and provided arm 28which acts by means of the pivoted rod 20 or the like in its turningmovement on the said lever 3.

The supply conduit between the regulator valve housing 5 and the casingof the control valve 3 is designated 2|. The corresponding returnconduit for returning the pressure medium from the control valve 3 tothe regulator valve is designated 22. The supply conduit extendingbetween the control valve casing and the cylinder 4 of the motor meansis designated l5 while the corresponding return conduit is designatedIG. The conduits |5, |3, 2| and 22 are necessarily flexible because ofthe relative movement occurring between the motor means, the controlvalve 3 and the regulator valve. The path of the pressure medium in thevarious operative positions of the parts of the device is indicated byarrows in the respective figures of the drawings.

The modus operandi oi the motor means. control and regulator valves inaccordance with the invention is as follows:

As is clear from Figure l in the starting position of the arrangement,if the regulator valve 5 were not present the oil or pressure mediumsupplied through the conduit I under pressure would pass through theconduit 2| into the casing of the control valve 3 and collect there asthe conduits I5 and ii are closed by the control piston. It musttherefore flow through an excess pressure valve provided in the oilsupply conduit into the return conduit 2. In order to avoid this, forthe reasons mentioned above, the regulator valve 5 is interposed betweenthe conduits and 2. The valve 5, in the initial position of the landingflap 1, provides a direct communication through the passage parts of thetransverse passage 6 between the conduits and 2 since the ball l2, inconsequence of the positions or the initiating member 8 and of theauxiliary member 9, is lifted by the plunger In from the valve seat 35.

If the landing flap is to be shifted from its initial position (Fig. 1)into the operative position (Fig. 3) the movement initiating membercomprising the manually operable lever 3 is brought to the positionshown in Fig. 2 and with it casing of the control valve 3 is shifted tothe right. The lower end 36 of the lever 8 thus swings to the left andthe lever moves into the position shown in Fig. 2, since the auxiliarymember 3 is in its initial position, the plunger ID with the ball I2 ispressed to the left by the spring 23. By the consequent seating of theball l2 on its seat 33 the communicating passage 6 is closed and the oilor pressure medium from the conduit I, since the control piston atpresent also is in its initial position. passes through the conduits 2|and |5 into the cylinder 4 of the motor means and there acts on thepiston l3.

The piston I3 is moved to the right and moves the landing flap I throughthe medium or the piston rod 24 and of the lever arm by rotation of theshaft into its working position shown in Fig. 3. The oil or pressuremedium at the right hand 01 piston |8 is thus forced through conduit l6into the casing of the control valve 3 and further through the bores 23,21 of the control piston |3 into the return conduits 22 and 2. Inconsequence of the rotary movement of the shaft H the auxiliary levermember 3 is now turned about its axis IS, on the one hand, by the leverarm '28 through the connecting rod 20 and the lever H and the plunger llfinally assumes 2,%21,150 the position shown in Fig. 3 when the flap 1is in its operative position; On the other hand on the rotary movementof the shaft 11 through the medium of the lever arm 29 the controlpiston it landing flap I is always balanced by the oil pres-1 sureacting on the working piston la.

The passage 2| which is subject'to fluid pres- I sure only duringactuation of the regulated structural element is preferably providedwith suitable known excessive pressure valve means (not shown).

It the landing flap l is to be returned from its operating positionshown in Fig. 3 into its initial position the lever 8 is turned into theposition shown in Fig. 4 and the cylinder of the control valve 3 is thusmoved to the left. The lower part of the lever 8 thus swings to therightand the lever Ii movesinto the-position shown in Fig. 4. Theplunger i is not moved as the auxiliary member 9 at the beginning of thereturn movement of the flap is still in its position shown in Fig. 4.

If the casing or cylinder of thecontrol valve 3 is shifted to the leftthe control cylinder and piston at this moment are in the positionrelative to one another shown in Fig. 4. The oil or pressure mediumcoming from the supply conduit i passes therei'ore into the cylinder 4of the motor means and displaces the piston IBto the left therein.- Theshaft i1 is thus rotated in counter-clockwise direction through themedium of the rod 24 and of the lever 25 and the landing flap 1 returnsgradually to its initial position. The pressure medium at the left ofthe piston is thus forced through the conduit l and the easing orcylinder of the controlvalve I into the return conduits 22 and 2. I

With the movement or rotation of the landing flap the piston I3 of thecontrol valve 3 is also moved to the left until the landing flap 1' hasreached its initial position. At this moment the control piston It thencloses the connections between the casing or cylinder of the controlvalve 3 and the conduits l5 and i6. Moreover, on the return movement ofthe landing flap I, the auxiliary member 9 is turned about its pivot i8to the right by the lever arm 28 through the connecting rod and thelever ii, and the plunger III is thereby brought to the initial positionshown in Fig. 1. The plunger Ill thus unseats the ball valve member I!from the valve seat 35 during the last part of its rightward movement sothat the direct connection between the conduits I and 2 is provided bythe passage 6 as soon as the landing flap has reached its initialposition. All the parts of the device are then again in the positionshown in Fig. 1.

I claim:

1. In fluid pressure means for controlling a movable element includingfluid motor means a pressure fluid source,

operatively connected to said movable element, control valve means forcontrolling the supply of fluid to said motor means including a movablecylinder and a piston reciprocable in said cylin- 'der and connectedwith said movable element for movement therewith, supply and returnconnections extending to said controlvalve means from a regulator valvehaving therein supply and return passages forming.portions of saidsupply and return connections, a by-pass passage inv said regulatorvalve adapted when open to connect said supply and return passages insaid regulator valve, normally closed valve meansin said by-passpassage, and valve operating means responsive to predeterminedpositioning of said control valve cylinder and said movable element foropening said by-pass passage.

2. Apparatus according to claim 1, said valve means including a ballnormally spring pressed to seating position, and said valveoperatingmeans' including a plunger normally resiliently withdrawn fromsaid ball, a double armed lever pivoted on said plunger, a manuallyoperable lever for moving said control valve cylinder and having an endportion engageable with one arm of said double armed lever, and anauxiliary lever member'engageable with the other arm of said 'doublearmed lever and connected with said movable element for movementtherewith.

3. In an apparatus for controlling the flow of pressure fluid in adevice containing control valve members relatively movable by manualactuation of a lever having a fixed pivot, said control valve memberscontrolling the supply'and return of fluid from the cylinder of a fluidmotor having a piston reciprocating therein, said piston having aconnecting rod operatively connected with a structural member forimparting movement thereto, the combination or a valve member connectedby passages with the supply and return conduits from a control valvedevice and movable automatically into its closing position for thesupply of fluid through said control valve to said fluid motor, andoperating means for means including a double armed lever connected withsaid valve member, said double armed lever being engageable at one endwith said manually actuated lever for movement thereby and engageable atthe opposite end by an auxiliary member movable with the shiftablestructural member and including a lever rotatably mounted on a fixedpivot, said double armed lever of the operating means being released bysaid manually actuable lever at the beginning of the displacement of thestructural member from initial to adjusted position in such manner thatin turning about said auxiliary member, it controls the said powertransmission member to such extent that the valve member moves into itsclosing tion. o posi HANS REBESKI.

opening said valve member, said operating

